Sewing-machine looper mechanism.



M. HEMLEB. SEWING MACHINE LOOPER MECHANISM. APPLICATION FILED AUG.3. 1915.

L%%,%& Patented Jan. 22,1918;

r L [T ig j W? V L03 A? 45 4a 4a is? 20'- 44 34 55 r 41 L M n- H I X "1 35 g) M Ea 4 i; 3f i WM A TTOR/VEV an sarnernnn men MARTIN HEMLEB, F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER 1V[A1\TUFAC TUBING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE LOOIER MECHANISM.

Application filed August 3, 1915.

. To all whom it may concern:

Be it known that I, MARTIN HEMLEB, a citizen of the United States, residing at Elizaate shaft. second crank-arm connected by a link with a beth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Looper Mechanisms, of which the following is a specification, reference being had therein tothe accompanying drawings.

This invention is designed particularly for embodiment in machines employing tandem high speed with a minimum of wear and noise of the parts.

In the preferred embodiment of the improvement, a looper-supporting rock-shaft is mounted in substantially end-to-end relation with the mainor actuating shaft with which it is operatively connected by means of an intermediate rock-shaft arranged below the main-shaft and deriving rocking movements from a cam-wheel fixed upon the actuating shaft and provided in one face with a cam-groove entered by a roller-stud upon a crank-arm fixed upon the intermedi- The intermediate shaft has a shorter crank-arm upon the looper-actuating rocleshaft thus deriving rocking movements from the actuating shaft.

The looper-supporting rock-shaft sustains a transverse fulcrum-pin upon which is mounted the looper-carrier sustaining the looper and formed below the fulcrum-pin with a segmental raceway. The looper-carrier raceway is entered by a stud at an extremity of an elbow-lever having its opposite end fulcrumed upon a stud disposed laterally of and transversely to the actuating shaft and provided at the elbow with a stud entering a peripheral cam-groove of a cam fixed upon the main-shaft and adapted to impart to the looper-carrier rocking movements in a direction lengthwise of the supporting rock-shaft.

Specification of Letters Patent.

Patented Jan. 22, 191%.

Serial No. 13,358.

The invention will be understood by reference to the accompanying drawings, in which Figure 1 is a front side elevation of a sewing machine embodying the present improvement, and Fig. 2 a plan of the same with the overhanging arm removed to expose the parts beneath. Fig. 3 is a front end View of the thread-handling elements and a portion of the looper-actuating mechanism. Fig. 4 is an elevation of the looper taken from the opposite side. Fig. 5 is a sectional elevation of the intermediate rock-shaft and its actuating means. Fig. 6 is a perspective view, upon an enlarged scale, of the looper.

As represented in the drawings, the frame is of well known form comprising the base 1 from which rises the standard 2 sustaining the overhanging arm 3. The main or actuating shaft 4c is suitably journaled in the base and is provided with the belt-wheel 5 and adjacent crank 6 connected in a well known manner by'means of the pitman 7 with a crank-arm 8 upon the needle-actuating rockshaft 9 journaled in the arm 3 and having at its forward end a crank connected by the pitman 10 with the reciprocating needle-bar 11 carrying the clamp 12 in which are secured in tandem relation the needles 13.

Cooperating with the needles 13 is a looper formed with the substantially triangular blade 14: and shank 15 secured upon the carrier 16. The contracted middle portion of the carrier 16 is mounted upon the transverse fulcrum-pin 17 within a forked head 18 of the looper-supporting rock-shaft 19 journaled in a bearing standard of the base parallel with and in substantially endto-end relation with the main-shaft. The looper-carrier is secured upon the fulcrumpin by means of the set-screw 20.

The lower portion of the looper-carrier is enlarged into segmental form and is provided with a similarly shaped raceway 21 which is entered by the divided bearing block 2'2 embracing the ball-stud 23 which is secured in the boss 24; of the forwardly extending arm 25 of an elbow-lever whose transverse arm 26 is formed with a boss 27 which is entered by the fixed fulcrum-stud '28 disposed transversely to and at the rean ward side of the shaft 4.

The lever 25 26 carries at its elbow a follower in the form of a roller-stud 29 which enters the cam-groove 30 in the collar 31 fixed upon the actuating shaft 4-. which imthrough the tandem-arranged needles.

parts to the lever 25 26 vibratory movements which are communicated through the described connections to the looper-carrier in rocking movements upon the fulcrum-pin 17 lengthwise of. the actuating shaft. The base 1 is shown provided with a seat 32 serv ing as a support for the boss 2% at the outer end of the lever-arm 25.

The rock-shaft 19 has secured upon its forward end the crank-arm 33 carrying the stud-pin 34 which is embraced by one of the apertured ends of the short link 35 whose other end embraces a similar stud-pin 36 upon the upwardly extending crankarm 37 fixed upon the forward end. of the intermediate rock-shaft 38 which is mounted in suitable bearings of the base 1. The rock-shaft 38 has secured upon its opposite end the hub 39 of a crank-arm 40 carrying at its outer end the roller-stud 41 which enters the cam-groove 42 in the face of the disk e3 having its hub 14 fixed upon the actuating shaft 4:. r

The looper-supporting rock-shaft 19 thus derives from the cam-disk 13 rocking movements which are communicated to the loopercarrier by means of the transverse fulcrumpin 17 to produce the operative or loop-seizing and shedding movements of the looperblade 14, the sidewise movements of the looper-blade being derived from the cam element 31 upon the shaft 4, as before described. The endwise and sidewise movements of the looper-blade are so timed that the looper point moves in an L-shaped path, the endwise and sidewise movements being alternated, and the sidewise movements taking place in the extreme advance position of the looper-point following the seizing of the thread-loops from the needles. The descent of the needles occurs while the looper is per forming its to-and-fro sidewise movements to enable the needles to pass through the previously formed thread-loops which are held distended for the purpose by the looper.

The machine may be provided with any usual or suitable auxiliary thread-handling devices, such as the tension and take-up, and has also suitable feeding mechanism comprising a feed-dog 15 working through a suitable aperture in the throat-plate etiwhich is secured upon the work-plate 47 in practice sustained upon suitable standards of the frame.

As will be seen from the drawings, the looper-blade 14 is directed within the line of feed and parallel with a plane passing Its supporting rock-shaft 19 is in the present embodiment arranged in substantial alinement with the actuating shaft 1 and upon the opposite side of the line of feed from the cam element 31, the respective operative connections of the rock-shaft 19 and the loopercarrier 16 with the actuating shaft thus exan actuating shaft, a looper-supporting rockshaft, a looper-carrier mounted to rock with but movable lengthwise relative to said rockshaft, a looper mounted upon said carrier, means connected with the actuating shaft for rocking the looper-supporting shaft, a

vibrating lever mounted upon a fixed fulcrum and. operatively connected with and adapted to impart to said carrier movements lengthwise of said rock-shaft, and an operative connection between said lever and the actuating shaft. 7

2. In a sewing machine, in combination, an actuating shaft, a looper-supporting rockshaft, a looper-carrier mounted to rock with but movable lengthwise relative to said rockshaft, a looper upon said carrier, means connected with the actuating shaft for rocking the looper-supporting shaft, a vibrating lever operatively connected with and adapted to impart to said carrier movements lengthwise of said rock-shaft, a fixed fulcrum for said lever disposed transversely of and at one side of the actuating shaft, and an operative connection between said lever and the actuating shaft.

3. In a sewing machine, in combination, an actuating shaft, a looper-supporting rockshaft, a looper-carrier mounted to rock with but movable lengthwise relative to said rockshaft, a looper upon said carrier, means connected with the actuating shaft for rocking the looper-supporting shaft, a vibrating lever, a fixed fulcrum therefor, a'sliding and pivotal connection between said lever and the looper-carrier, and an operative connection between said lever and the actuating shaft. 7

4:- In a sewing machine, in combination, an actuating shaft, a looper-supporting rocksh'aft, a looper-carrier mounted to rock with but movable lengthwise of said rock shaft, a looper upon said carrier, means connected with the actuating shaft for rocking the looper-supporting shaft, a peripherally grooved cam upon said actuating shaft, an angular lever fulcrumed at one side of said shaft and provided with a stud entering the groove of said cam and having an arm extending lengthwise of the actuating'shaft toward the looper-carrier, and a sliding connection between said arm of the vibrating lever and the looper-carrier.

5. In a sewing machine, in combination, an actuating shaft carrying a cam element, a looper-supporting rock-shaft having its axis substantially in a plane embracing that of said actuating shaft, means connected with the actuating shaft for imparting to said rock-shaft its rocking movements, :1

looper-carrier mounted to rock with but movable lengthwise of said rock-shaft, a looper sustained by said carrier, a lever carrying a follower engaging said cam element and having an operative connection with said looper-carrier substantially within said plane from which the looper derives its movements lengthwise of the rock-shaft, and a. fulcrum for said lever at one side of said actuating shaft.

6. In a sewing machine, in combination, an actuating shaft carrying a cam element, feeding mechanism, a plurality of reciprocating needles in tandem arrangement relative to the direction of feed, a looper cooperating with said needles and having its blade directed within the line of feed, a looper-carrier, a rock-shaft upon which said carrier is endwiseqnovably mounted and disposed upon the opposite side of the line of feed from said cam element, means connected with said actuating shaft for rocking said rock-shaft, a lever carrying a follower engaging said cam element and having an operative connection with said looper-carrier substantially within a plane embracing the axes of said actuating shaft and said rockshaft, and a fulcrum for said lever at one side of said actuating shaft.

7. In a looper operating mechanism for sewing machines having a plurality of needles arranged one behind another in the direction of feed, in combination, a looper having a pointed blade or beak for entering the needle-thread loops in a direction opposite to the direction of feed, and mechanism for moving the pointed blade or beak of the looper in an angular shaped path having limbs respectively parallel and transverse to the line of feed including looper carrying rock-shaft, means for actuating the same, a pivotal connection between said rockshaft and said looper, a circular slideway fixed to the looper on the side of the pivotal connection opposite the blade of the looper, a lever fixedly fulcrumed at one end and having at its free opposite end a stud entering the circular slideway, means intermediate the ends of the lever for actuating it, and a fixed abutment sustaining the said free opposite end of the lever.

In testimony whereof, I have signed my name to this specification.

MARTIN HEMLEB.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

